Robot cleaner using artificial intelligence and controlling method thereof
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Solution Overview
Problem
Existing robot cleaners face challenges in obstacle detection due to costly sensor setups, potential resistance value errors from collisions, and decreased detection performance from collision accumulation, as well as the need for precise sensor placement angles.
Innovation Solution
A robot cleaner equipped with a collision detection unit using variable capacitance sensors, comprising transmitting and receiving electrodes with a dielectric layer, and a buffer portion to absorb impact, allowing for low-cost, reliable obstacle detection and collision strength determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistive film and metal film are used in the bumper structure to detect collision, then the robot cleaner can determine whether there is an obstacle by contact, but resistance value error may occur when the film is damaged due to collision accumulation
Solution Approach 1:
The patent replaces the mechanical contact-based resistive film sensing system with an electromagnetic sensing system using electromagnetic sensors that detect changes in electromagnetic field characteristics when approaching obstacles, eliminating wear and resistance drift issues associated with physical contact films
Solution Approach 2:
The patent introduces electromagnetic field as an intermediary between the sensor and obstacle, allowing detection without direct physical contact. The electromagnetic sensor detects obstacles through changes in electromagnetic field properties (capacitance, inductance, or resistance) caused by the presence of the obstacle, rather than requiring mechanical contact
2Reliability
If ultrasonic sensors are used to measure distance or detect obstacles, then detection capability is improved, but a plurality of sensor units are required while alternately arranging the transmitting sensor and the receiving sensor, thus increasing material cost
Solution Approach 1:
The patent employs electromagnetic sensors that can perform both transmission and reception functions within a single sensor unit, allowing the same sensor to emit electromagnetic signals and detect reflected or modified signals, thereby eliminating the need for separate transmitting and receiving sensor arrays
Solution Approach 2:
The patent combines the functions of transmission and reception into a single electromagnetic sensor unit, merging what were previously separate components (transmitting sensor and receiving sensor) into one integrated sensing element that operates both functions
3Measurement precision
If ultrasonic sensors are used to detect obstacles, then detection accuracy is improved, but precision of the placement angle is required
Solution Approach 1:
The patent utilizes electromagnetic sensors that detect obstacles through changes in electromagnetic field parameters (capacitance, inductance, or resistance) rather than relying on precise angular placement, allowing flexible sensor positioning while maintaining detection accuracy through electrical parameter measurement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides effective obstacle detection with minimized internal impact, reduced costs, and improved detection performance by using grouped sensors and electrostatic capacity sensing, enabling accurate collision location and strength determination.
Implementation Method 1
a collision detection unit configured to be disposed on the side of the main body and detect collision due to variable capacitance due to the collision with an external environment
Implementation Method 2
Each of the variable capacitance collision sensors comprises a transmitting electrode receiving a transmission signal, a counter electrode facing the transmitting electrode, a receiving electrode facing the counter electrode and outputting the detection signal, and a dielectric layer formed between the transmitting electrode, the counter electrode, and the receiving electrode
Data Source
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AI summary
A robot cleaner of the present disclosure includes: a traveling unit configured to move a main body; a cleaning unit configured to perform a cleaning function; a collision detection unit configured to be disposed on the side of the main body and detect collision due to variable capacitance due to the collision with an external environment; and a controller configured to determine whether the collision occurs according to a detection signal from the collision detection unit and control the traveling unit. Accordingly, obstacle detection of the robot cleaner can be implemented using a low-cost collision sensor, and by providing a bumper structure to the collision detection unit of the robot cleaner, it is possible to minimize the impact of the collision on the inside of the main body.